USB Relay 2 Channel Programmable Computer Control Power Supply Module For Smart Home Controller Board DC 5V 250V 10A

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2 channel 5v delay relay module ch340 ch340g micro usb to ttl intelligent control switch board programmable for arduino computer

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Usb serial port control 1 channel relay module 5v 10a ch340 overcurrent protection computer command control switch smart home

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1 2 4 8 16 channel dc 5v relay module with optocoupler low level trigger expansion board for arduino raspberry pi

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5v low level trigger one 1 channel relay power module interface board shield for arduino pic avr dsp arm mcu dc ac 220v

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